Spraying machine



Feb. 18, 1930. H LIBBEY 1,747,517

SPRAYING MACHINE Filed Sept. 24, 1927 2. Sheets-Sheet l I ,s 1 IIHIIIHI: IIIIIIIIIHIHHP-l INVENTOR.

ATTORN s.

Feb. 18, 1930. T. H. LIBBEY 1,747,517

SPRAYING MACHINE Filed Sept. 24, 1927 2 Sheets-Sheet 2 INVENTOR ATTORN EY 3 Patented Feb. 1a, 1930 um'reo STATES man? PATENT OFFICE THOMAS H. LIBBEY, OF SOUTH BEND, INDIANA, ASSIGNOR TO THE STUDEBAKER COR- 7'' PORA'IION, OF SOUTH BEND, INDIANA, A CORPORATION OF NEW JERSEY VSPRAYING MACHINE Application filed September 24, 1927. Serial No. 221,808.

This invention relates to means for applying protective coatings to articles of manufacture and particularly to a machine for spraying the interiors of metallic articles, such as internal combustion engine pistons and the like.

It is common practice with most manu facturers of internal combustion engines to provide the surfaces of cast parts, such as pistons and crank cases which come in contact with the lubricating oil, with a protective coating of some substance such as paint or lacquer. It is well known that when metallic parts are cast, that blow holes and imperfections occur which usually have deposits of moulding sand therein, and it has been found that regardless of the amount of shaking and knocking of the casting, there is always some sand left in the blow holes which will drop out only after the part has had considerable use. This isparticularly true with engine pistons, as the sand drops out of the blow holes into the lubricating oil and flows with the oil to the engine bearings and has a disastrous effect'thereon, hence, the inner surfaces of the pistons are usually coated with lacquer or some such substance which coats the surfaces and congeals in the blow holes to prevent the sand from worln'ng loose. a

So far as applicant is aware, he is the first to provide a machine for successfully spraying the pistons and other articles for quantity production and in a manner so that all parts of the interior thereof could be reached by the spray as the piston bushing bosses usually obstructed the spray stream. a

It is therefore, the principal object of the present invention, to provide a new and novel means for holding a plurality of articles and for spraying the interiors thereof with a coating substance.

Another object is to provide a machine for holding a plurality of articles and for spraying the interiors thereof, with a coat- ,ll'lg substance, the machine being provided with a rotary portion adapted to receive and rotate the articles to be sprayed.

Another object is to provide a machine for holding pistons while the-interiors thereof are being sprayed with acoating substance, said machine having a plurality of openings in a rotary portion for receiving the pistons and having a nozzle adapted to direct the spray stream through each of the openings into the interior of each piston-as it passes thereover.

Another object is to provide a machine the circle of openings and a pumping means for drawing the coating substance from the tank and forcing the same through the nozzle i so that it is directed into the interior of each piston as it passes over the nozzle.

These being among the objects of the present invention, the same consists of certain features of construction and combinations of parts to be hereinafter described with refer-,

ence to the accompanying drawings, and then claimed, having the above and otherobjects in view.

In the accompanylng drawings which illus- -I- trate a suitable embodiment of the present invention,

Figure 1 is an elevation showing the spray-.

ing machine and the pumping mechanism therefor.

Figure 2tis a plan view of the machine and pumping mechanism shown in Figure 1.

Figure 3 is a section taken approximately on the line 3-3 of Figure 2.

Figure 4. is a section taken on the line 9'0 of Figure 3.

It is to be understood that the present invention is not limited to a machine for pistons as it can be made to apply to any part which is desired to be coated or painted. It is also to be understood that the details of design of the pumping mechanism and cover rotating mechanism may be varied to meet existing conditions and that formal changes may be made in the specific embodiment of the invention described without departing from the spirit and substance of the broad invention, the scope of which is commensurate with the appended claims.

What I claim is 1.. In a device for applying protective coatings to articles of manufacture, a supply tank containing a coating liquid, article supporting means rotatably mounted above said tank, means for rotating said article supporting means, means for conducting the coating liquid from said tank to be applied to said articles, and means exteriorly of said tank including said article supporting means forming a seal for preventing the escape of coating liquid from said tank.

' 2. In a device for applying protective coatings to articles of manufacture, a supply tank containing a coating liquid, a rotary cylinder provided with a plurality ofapertures arranged concentrically therewith for receiving said articles, a stationary upwardly extending nozzle positioned below said cylinder, means for rotating said cylinder, means for conducting the coating liquid from said tank to said nozzle, said nozzle directing said coating liquid against each of said articles as they are moved thereover by said cylinder, and means exteriorly of said tank including said rotary cylinder forming a seal for preventing the escape of the liquid from said tank discharged from said nozzle.

3. In a device for applying protective coatings to articles of manufacture, a tank containing a coating liquid, a rotary cover for said tank formed with a plurality of openings arranged concentrically therewith, article receiving means positioned in said openings and having apertured bottoms, means for rotating said cover, a stationary upwardly extending nozzle within said tank positioned approximately below the circular center line of said article receiving members, a pump for conducting the liquid from said tank to said nozzle, the liquid stream exhausted from said nozzle passing through said apertured bottoms of said article receiving members to impinge against the surfaces of each article as it is moved thereover, and means exteriorly of said tank including said rotary cover forming a seal for preventing the escape from said tank of the liquid stream discharged from said nozzle. 7

4. In a device for applying protective coatings to articles of manufacture, a tank containing a coating liquid, a rotary cover for said tank provided with means for su-p porting said articles, a'circular' outwardly extending flange surrounding said tank and secured'thereto, a'plurality of spaced vertically positioned rollers rotatably mounted on said cover for rotatably supporting said cover on said flange, means for rotating said cover, and means for directing a stream'of for spraying liquid against said articles supported by said cover,

6. In a device for applying protective coatings to articles of manufacture, atank containing a coating liquid, a circular band surrounding said tank provided With a horizontal outwardly extending flange, a rotary cover for said tank provided with a plurality of article receiving members arranged concentrically thereof, a plurality of spaced vertically positioned rollers rotatably mounted on said cover to rotatably support said cover on said flange of said band, a plurality of spaced horizontally positioned rollers mounted on said cover to concentrically center said cover on said band surrounding said tank, means for rotating said cover, and means for pumping said liquid to successively spray each of said articles supported by said cover.

7. In a device for applying protective coatings to articles of manufacture, com-' prising a supply tank for a coating liquid,a cover for said tank having a top and a circular side wall rotatably positioned to "support a plurality of said articles arranged concentrically therewith, stationary means within said tank adapted to successively spray said articles moved thereover by said rotary cover, a circular upwardly and outwardly extending member surrounding said tank and the circular wall of said cover forming a trough, and liquid in said. trough, thereby forming an airtight seal between the interior and exterior of said tank to prevent the escape of coating liquid therefrom.

8. In a device for applying protective coatings to articles of manufacture, comprising a tank containing a coating liquid,

a rotary cover over said tank supporting the articles to be coated, means for rotating said cover, a nozzle Within said tank for coating said articles as they are moved by the rotation of said cover, a liquid pump for supplying" said nozzle. with liquid fromseid tank, and am -secondary discharge pipe extending from-Said pump into the liquid in said tanks below the. liquid; level ithereover, whereby excess liquid circulated by said pump passes through said secondarydischarge. nozzle to 'gitate the liquid in saidtank to thoroughly mix the same. v v

w Signed by. -me at South Bend, Indiana, this 21st day of September,'1927.'

' x THOMAS H. LIBBEY. 

